Unlike UPX where you can just upx -d, Virbox requires manual execution. The "Top" method is called the OEP (Original Entry Point) pivot using hardware breakpoints and memory traps.
Once you have hit the OEP, the memory is in a "clean" but still encrypted state for imported functions. Process dumping is risky; Virbox will likely call ExitProcess if it detects a dump attempt. virbox protector unpack top
Top Technique: Use PAGE_GUARD magic.
Even with the above methods, “unpack top” remains elusive. Here’s why: Unlike UPX where you can just upx -d